This regulator is Missing the Piston, Shredder Pin & Valve, Spring, Spring Plate. In-short there are not guts in the regulator.
It does have the Velocity adjustment screw.
Torpedo Regulator by Bob Long for their Intimidator. There is some tool marks on the regulator. See pictures. Seen often on the GZ edition Intimidator.
This item has not been tested of yet and may need a rebuild.